EFFECTS OF BLAST-FURNACE SLAG ON NATURAL POZZOLAN-BASED GEOPOLYMER CEMENT

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2011
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Abstract
A number of geopolymer cement mixes were designed and produced by alkali-activation of a pumice-type natural pozzolan. Effects of blast-furnace slag on basic engineering properties of the mixes were studied. Different engineering properties of the mixes such as setting times and 28-day compressive strength were studied at different amounts of blast-furnace slag, sodium oxide content, and water-to-cement ratio. The mix comprising of 5 wt.% blast-furnace slag and 8 wt.% Na2O with a water-to-dry binder ratio of 0.30 exhibits the highest 28-day compressive strength, i.e. 36 MPa. Mixes containing 5 wt.% of ground granulated blast furnace slag showed the least efflorescence or best soundness. Laboratory techniques of X-ray diffractometry (XRD), fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were utilized for characterizing a number of mixes and studying their molecular and micro-structure. Investigations done by scanning electron microscopy confirm that smaller blast-furnace slag particles react totally while the larger ones react partially with alkaline activators and contribute to the formation of a composite microstructure.
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Authors YAZDANIPOUR, MAHSHAD;KANI, EBRAHIM NAJAFI;ALLAHVERDI, ALI;
Journal ceramics-silikáty
Year 2011
DOI
DOI not found
URL
http://www.ceramics-silikaty.cz/2011/pdf/2011_01_68.pdf
Keywords
microscopy Materials of engineering and construction. Mechanics of materials Engineering (General). Civil engineering (General) Biotechnology Technology Electrical engineering. Electronics. Nuclear engineering Descriptive and experimental mechanics physics building construction clay industries. ceramics. glass

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